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    Tabular display of the chemical elements
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    The periodic table is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. It organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number. The table was devised by Russian chemist Dmitri Mendeleev in 1869. The table places elements into columns (groups) and rows (periods) that share certain properties, which determine an element’s physical state at room temperature and its chemical reactivity.
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